| Starter | Tm | Tier | Game |
|---|---|---|---|
| Bob Gibson | SLN | 6.82 | 196608180_SLN_LAN |
| Gary Peters | CHA | 4.91 | 196608180_CHA_CLE |
| Claude Osteen | LAN | 4.15 | 196608190_SLN_LAN |
| Jim Maloney | CIN | 3.51 | 196608180_CIN_HOU |
| Mike Cuellar | HOU | 2.08 | 196608200_CIN_HOU |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Dick Ellsworth | CHN | -3.05 | 196608190_PIT_CHN |
| Bob Bruce | HOU | -2.54 | 196608180_CIN_HOU |
| Fred Talbot | NYA | -2.52 | 196608191_OAK_NYA |
| Rob Gardner | NYN | -1.22 | 196608180_PIT_NYN |
| Tony Cloninger | ATL | -0.87 | 196608200_ATL_SFN |
Based on accumulated WAA for this season up to 1966-08-20.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +001+ | 10.32 | Sandy Koufax | 237 | LAN |
| +006+ | 7.02 | Juan Marichal | 218.7 | SFN |
| +009+ | 6.27 | Bob Gibson | 210.7 | SLN |
| +010+ | 6.1 | Al Jackson | 191 | SLN |
| +011+ | 5.96 | Jim Bunning | 226 | PHI |
| +013+ | 5.71 | Gary Peters | 167 | CHA |
| +014+ | 5.71 | Tommy John | 172 | CHA |
| +020+ | 4.7 | Mike Cuellar | 158.7 | HOU |
| +024+ | 4.37 | Gaylord Perry | 189 | SFN |
| +025+ | 4.31 | Claude Osteen | 192.7 | LAN |
| +027+ | 4 | Jim Maloney | 181.3 | CIN |
| +032+ | 3.83 | Joe Horlen | 162 | CHA |
| +033+ | 3.57 | Steve Barber | 123.7 | BAL |
| +037+ | 3.38 | Bruce Howard | 108.7 | CHA |
| +040+ | 3.26 | Jim Kaat | 215.7 | MIN |
| +042+ | 3.21 | Jim Grant | 188 | MIN |
| +044+ | 3.16 | Jim Perry | 130.7 | MIN |
| +050+ | 2.83 | Steve Hargan | 125 | CLE |
| +056+ | 2.58 | Dave McNally | 165.7 | BAL |
| +062+ | 2.5 | Dennis Ribant | 144 | NYN |
| +063+ | 2.46 | Dave Boswell | 157 | MIN |
| +069+ | 2.32 | Gary Bell | 204.7 | CLE |
| +075+ | 2.18 | Sonny Siebert | 198 | CLE |
| +084+ | 1.91 | George Brunet | 167 | ANA |
| +086+ | 1.86 | Sam McDowell | 131 | CLE |
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